US4034076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making toothpaste
Assignee: Lever Brothers Co
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Filing: 1975-03-03
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Granted: 1977-07-05
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Expires: 1995-03-03
Abstract
Abstract This invention relates to a process for inhibiting the swelling of aluminium tubes containing toothpastes comprising alumina trihydrate, in which process there is incorporated in the toothpaste a silica sol of which the silica particles are negatively charged.
Inventors
- 👤 James Coulson
- 👤 Malcolm Richard Nearn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:27
CPC Classifications
A; A61; A61Q; A61Q11/00; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
Process for inhibiting the swelling of aluminum toothpaste tubes containing a toothpaste composition comprising from about 20 percent to about 60 percent by weight of an alumina trihydrate having an average particle size of from about 3 to about 30 microns, in which process there is incorporated in the toothpaste composition a silica sol of which the silica particles are negatively charged in an amount of at least about 0.001 percent, calculated as silica by weight of the toothpaste, effective to stabilise the toothpaste against gassing of the aluminum tubes.
Claim 2
Dependent Claim
90 words
Process for inhibiting the swelling of aluminum toothpaste tubes containing a toothpaste composition comprising from about 20 percent to about 60 percent by weight of an alumina trihydrate having an average particle size of from about 3 to about 30 microns, in which process there is incorporated in the toothpaste composition a silica sol of which the silica particles are negatively charged in an amount of at least about 0.001 percent, calculated as silica by weight of the toothpaste, effective to stabilise the toothpaste against gassing of the aluminum tubes.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein said silica sol has a silica concentration of from about 5 percent to about 40 percent by weight.
Claim 4
Dependent Claim
37 words
A process as claimed in claim 1, wherein said silica sol is incorporated in the toothpaste composition in an amount of from 0.001 percent to about 3 percent calculated as silica by weight of the toothpaste composition.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1, wherein the toothpaste composition has a pH of about 6 to about 8.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |